1 files changed, 150 insertions, 0 deletions
diff --git a/src/global/mail_run.c b/src/global/mail_run.c
new file mode 100644
index 0000000..f376434
--- /dev/null
+++ b/src/global/mail_run.c
@@ -0,0 +1,150 @@
+/*++
+/* NAME
+/*	mail_run 3
+/* SUMMARY
+/*	run mail component program
+/* SYNOPSIS
+/*	#include <mail_run.h>
+/*
+/*	int	mail_run_foreground(dir, argv)
+/*	const char *dir;
+/*	char	**argv;
+/*
+/*	int	mail_run_background(dir, argv)
+/*	const char *dir;
+/*	char	**argv;
+/*
+/*	NORETURN mail_run_replace(dir, argv)
+/*	const char *dir;
+/*	char	**argv;
+/* DESCRIPTION
+/*	This module runs programs that live in the mail program directory.
+/*	Each routine takes a directory and a command-line array. The program
+/*	pathname is built by prepending the directory and a slash to the
+/*	command name.
+/*
+/*	mail_run_foreground() runs the named command in the foreground and
+/*	waits until the command terminates.
+/*
+/*	mail_run_background() runs the named command in the background.
+/*
+/*	mail_run_replace() attempts to replace the current process by
+/*	an instance of the named command. This function never returns.
+/*
+/*	Arguments:
+/* .IP argv
+/*	A null-terminated command-line vector. The first array element
+/*	is the base name of the program to be executed.
+/* DIAGNOSTICS
+/*	The result is (-1) if the command could not be run. Otherwise,
+/*	mail_run_foreground() returns the termination status of the
+/*	command. mail_run_background() returns the process id in case
+/*	of success.
+/* CONFIGURATION PARAMETERS
+/*	fork_attempts: number of attempts to fork() a process;
+/*	fork_delay: delay in seconds between fork() attempts.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <stringops.h>
+#include <mymalloc.h>
+
+/* Global library. */
+
+#include "mail_params.h"
+#include "mail_run.h"
+
+/* mail_run_foreground - run command in foreground */
+
+int     mail_run_foreground(const char *dir, char **argv)
+{
+    int     count;
+    char   *path;
+    WAIT_STATUS_T status;
+    int     pid;
+    int     wpid;
+
+#define RETURN(x) { myfree(path); return(x); }
+
+    path = concatenate(dir, "/", argv[0], (char *) 0);
+
+    for (count = 0; count < var_fork_tries; count++) {
+	switch (pid = fork()) {
+	case -1:
+	    msg_warn("fork %s: %m", path);
+	    break;
+	case 0:
+	    /* Reset the msg_cleanup() handlers in the child process. */
+	    (void) msg_cleanup((MSG_CLEANUP_FN) 0);
+	    execv(path, argv);
+	    msg_fatal("execv %s: %m", path);
+	default:
+	    do {
+		wpid = waitpid(pid, &status, 0);
+	    } while (wpid == -1 && errno == EINTR);
+	    RETURN(wpid == -1 ? -1 :
+		   WIFEXITED(status) ? WEXITSTATUS(status) : 1)
+	}
+	sleep(var_fork_delay);
+    }
+    RETURN(-1);
+}
+
+/* mail_run_background - run command in background */
+
+int     mail_run_background(const char *dir, char **argv)
+{
+    int     count;
+    char   *path;
+    int     pid;
+
+#define RETURN(x) { myfree(path); return(x); }
+
+    path = concatenate(dir, "/", argv[0], (char *) 0);
+
+    for (count = 0; count < var_fork_tries; count++) {
+	switch (pid = fork()) {
+	case -1:
+	    msg_warn("fork %s: %m", path);
+	    break;
+	case 0:
+	    /* Reset the msg_cleanup() handlers in the child process. */
+	    (void) msg_cleanup((MSG_CLEANUP_FN) 0);
+	    execv(path, argv);
+	    msg_fatal("execv %s: %m", path);
+	default:
+	    RETURN(pid);
+	}
+	sleep(var_fork_delay);
+    }
+    RETURN(-1);
+}
+
+/* mail_run_replace - run command, replacing current process */
+
+NORETURN mail_run_replace(const char *dir, char **argv)
+{
+    char   *path;
+
+    path = concatenate(dir, "/", argv[0], (char *) 0);
+    execv(path, argv);
+    msg_fatal("execv %s: %m", path);
+}